Make libfs_mgr dependencies vendor_ramdisk_available.

This is needed to link libfs_mgr with snapuserd.

Bug: 193833730
Test: builds
Change-Id: If499d7ec060f9964ccd6900dcaa6425a34ae5ec8
diff --git a/libkeyutils/Android.bp b/libkeyutils/Android.bp
index fbb8049..3af07b4 100644
--- a/libkeyutils/Android.bp
+++ b/libkeyutils/Android.bp
@@ -14,6 +14,7 @@
     cflags: ["-Werror"],
     defaults: ["linux_bionic_supported"],
     ramdisk_available: true,
+    vendor_ramdisk_available: true,
     recovery_available: true,
     export_include_dirs: ["include/"],
     local_include_dirs: ["include/"],